The greedy flag (-g) now causes the VMM 2LS to do the following:
- Ask for N + 1 vcores, with N == nr_guest_cores.
- Assume all of those vcores are allocated (optimistic)
- Never yield those vcores
- All task threads run on vcore 0, including timer alarms
- All other vcores run their respective guest thread or controller thread.
E.g. vcore 1 run GPC 0.

With this, guest cores are never rescheduled - they stay on the same vcore,
and thus the same underlying pcore, since we never yield.

Note that this assumes all vcores are allocated and remain that way. So
any preemptions will screw it up. Fixing that is a much harder TODO.